package jdbc;

import java.sql.Connection;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;

/**
 * 执行关联查询
 */
public class JDBCDemo5 {
    public static void main(String[] args) {
       /*
            查看王克晶所带班级的信息
            列出老师名字，工资，职称以及班级的名字
        */
        try(
                Connection con = DBUtil.getConnection()
                ) {
            Statement stmt = con.createStatement();
            String sql = "SELECT t.name,t.salary,t.title,c.name,c.floor " +
                         "FROM teacher t "+
                         "JOIN class c ON t.id = c.teacher_id " +
                         "WHERE t.name = '王克晶'";
            System.out.println(sql);
            ResultSet rs = stmt.executeQuery(sql);
            while (rs.next()){
                //获取字段值时可以使用字段索引，注意:从1开始为结果集第一个字段。可读性差，不推荐
                String tName = rs.getString(1);
                int tSalary = rs.getInt(2);
                String tTitle = rs.getString(3);
                String cName = rs.getString(4);
                int cFloor = rs.getInt(5);
                System.out.println(tName+" "+tSalary+" "+tTitle+" "+cName+" "+cFloor);
            }
        }catch (Exception e){
            throw new RuntimeException(e);
        }
    }
}
